juvenility vs youthfulness

juvenility and youthfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
juvenility	Yes	No	No	No
youthfulness	Yes	No	No	No

As nouns, juvenility and youthfulness are synonyms defined as:

juvenility and youthfulness: the freshness and vitality characteristic of a young person

Other synonyms of juvenility include youth.

juvenility (noun)	youthfulness (noun)
the freshness and vitality characteristic of a young person	the freshness and vitality characteristic of a young person
lacking and evidencing lack of experience of life